Merb. Must be some modern, knockable kind of cubicle wall. At Intel, the cubicle walls were steel-and-plastic frames covered with cloth -- but mostly cloth, so you couldn't knock on them.
Ain't progress wonderful? Now we get cubicle walls you can actually knock on, if you wood. (Or "would.")
Probably the cloth ones, from what I can tell of the videos they have posted, but you can still knock on the metal frames.
In any case, to attempt again to get this back on topic*, while Trevor was never the most active person on the forums, 99% of the information that I leaked was him letting me know I could, and a lot of his time was spent trying to get more information out of WotC. The columns Rule of 3 and Mike's column (the name escapes me for the moment) are a direct result of Trevor working hard to get more information and communication out of WotC to the fans.
* When there are at least 2 other threads on the MB, DDI and peoples opinions on how WotC has been doing, I would like to please ask people to not turn this thread into a third.